Predetermines is a term that refers to something that is already set in stone or decided beforehand. Some synonyms for this word include predestines, foreordains, preordains, determines, and decides. These words all convey the idea of a predetermined fate or outcome that cannot be changed, altered or influenced. Other synonyms include rules, dictates, and governs, which denote a strict regulation or control of a situation. These words can be used interchangeably depending on the context of the situation. Overall, synonymous words with predetermines can help in expressing and conveying a clear understanding of how events and outcomes are predetermined.